On Tue, 18 Jul 2006, Bertrik Sikken wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > m. allan noah wrote: >> recent model fujitsu scanners dont have native brightness/contrast/gamma >> support, instead they use an 256x256 or 1024x256 bit look up table to >> convert the raw scan data before 8 bit output. >> >> while it is true that the 8bit square LUT could be done after scanning >> with no data loss, most command line front-ends dont do this, and the 10 >> bit lut has 'access' to more data that never gets out of the scanner, so >> i would like to extend the backend to provide at least >> brightness/contrast for these scanners. >> >> i need suggestions or pointers to code that i could use. what things i >> can find are far over my head, but i have a simple brightness adjustment >> that shifts the linear slope of the in-out function up or down, and a >> crude contrast setting that changes the slope of the function around the >> center of the table. i think both of these methods are likely too >> simplistic. >> >> anyone? > > As far as I know, xsane automatically calculates and downloads a gamma > table for brightness / contrast / gamma if the backend advertises it. >
interesting! do you know of a backend that does this? i would like to see the option structures which are used... of course, not everyone uses xsane, so i might have to steal the code from it :) allan > Bertrik > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.2 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org > > iD8DBQFEvRIlETD6mlrWxPURAtQfAJ0Z9F+lAP8mh96E7fRkJuHuMmu8vgCgpP/l > PWk5WXjsUe/hYPEV47QbbFw= > =sNyM > -----END PGP SIGNATURE----- > > -- "so don't tell us it can't be done, putting down what you don't know. money isn't our god, integrity will free our souls" - Max Cavalera
